Cryptology ePrint Archive: Report 2020/1458

Analysis of Ascon, DryGASCON, and Shamash Permutations

Cihangir Tezcan

Abstract: Ascon, DryGASCON, and Shamash are submissions to NIST's lightweight cryptography standardization process and have similar designs. We analyze these algorithms against subspace trails, truncated differentials, and differential-linear distinguishers. We provide probability one 4-round subspace trails for DryGASCON-256, 3-round subspace trails for \DryGASCON-128, and 2-round subspace trails for \Shamash permutations. Moreover, we provide the first 3.5-round truncated differential and 5-round differential-linear distinguisher for DryGASCON-128. Finally, we improve the data and time complexity of the 4 and 5-round differential-linear attacks on Ascon.

Category / Keywords: secret-key cryptography / lightweight cryptography, authenticated encryption, cryptanalysis

Original Publication (in the same form): International Journal of Information Security Science

Date: received 18 Nov 2020

Contact author: cihangir at metu edu tr

Available format(s): PDF | BibTeX Citation

Note: Published version is available at

Version: 20201119:094949 (All versions of this report)

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